5 years later

REUTERS/Chris Keane

A small United States flag is displayed along with flowers at a plague located in the April 16 memorial on the campus of Virginia Tech in Blacksburg, Virginia April 16, 2012. Virginia Tech on Monday will mark the fifth anniversary of the deadliest act of gun violence in modern U.S. history, a massacre that killed 32 people, prompted congressional action and spurred universities nationwide to enhance their alert systems.

A small United States flag is displayed along with flowers at a plague located in the April 16 memorial on the campus of Virginia Tech in Blacksburg, Virginia April 16, 2012. Virginia Tech on Monday will mark the fifth anniversary of the deadliest act of gun violence in modern U.S. history, a massacre that killed 32 people, prompted congressional action and spurred universities nationwide to enhance their alert systems. (REUTERS/Chris Keane)

A small United States flag is displayed along with flowers at a plague located in the April 16 memorial on the campus of Virginia Tech in Blacksburg, Virginia April 16, 2012. Virginia Tech on Monday will mark the fifth anniversary of the deadliest act of gun violence in modern U.S. history, a massacre that killed 32 people, prompted congressional action and spurred universities nationwide to enhance their alert systems.